Folks, just a heads-up. I had the classical challenge of showing a strip of thumbnail images in response to grid row selections. I was about to clone some code I wrote many years ago that did something similar, but it was a tangle of code which put requests in an asynchronous queue. Then I vaguely recalled reading about the "IsAsync" Binding property fewer years ago in WPF Unleashed <http://adamnathan.net/wpf/>.
Well, IsAsync is miraculously easy and it works as advertised. You assign multiple binding properties, each one is expected to take a different amount of time, and it all just works. The basic example HERE<http://msdn.microsoft.com/en-us/library/system.windows.data.binding.isasync.aspx>shows how to do it. Hundreds of lines of my ancient code was replaced with about 10 lines, so I presume I didn't ever notice IsAsync back then. Because the binding runs on a worker thread you can't return something forbidden to use across threads, so I had to return the string URI of the image and not an actual BitmapSource. I don't think you can do this in Silverlight, but I'm not certain. Greg K
